Showing papers in "Advanced Powder Technology in 2000"

TL;DR: In this article, the attrition of catalysts in fluid catalytic cracking (FCC) units is discussed and a number of test methods exist, which have been very useful in tackling design issues.

TL;DR: In this paper, the authors measured pressure fluctuations in a fluidized bed plenum and power spectral density functions obtained by fast Fourier transform analysis of the pressure fluctuation and its confidence limit for the diagnosis of fluidization were investigated.

TL;DR: In this article, the formation of a particle deposition layer has been investigated as a simultaneous phenomenon of particle deposition and reentrainment in a turbulent aerosol flow in a glass tube equipped with a ring-type electrode.

TL;DR: In this paper, the impact energy of the balls, E i, during the ball milling process was calculated based on the particle element method, and the rate constants of the size reduction and structural change into the amorphous state were investigated.

TL;DR: In this article, LiCo 0.2 Ni 0.8 O 2 in the scrap was pulverized and became amorphous by mechanochemical treatment for 60 and 240 min, respectively, with and without Al 2 O 3 power.

TL;DR: By using a thermal separator and a vortex mill, a cryogenic grinding system was established in this article, in which experiments were performed to grind scrap tire peels into fine powders.

TL;DR: In this paper, a technique has been developed to measure the thickness of the adsorbed moisture layer on particulate surfaces using atomic force microscopy (AFM) and the deformation or bulging of liquid layers due to attractive van der Waals forces as they approach one another.

TL;DR: In this article, Nb and Ta-doped nanocrystalline TiO 2 powders, doped in range of 0.05-5 mol% nb andTa, have been prepared using a chemical method.

TL;DR: In this paper, a case study of the origin of property variation with spray dryer size is presented. But the authors do not consider the use of particle size measurements in the manufacturing process of fine ceramics.

TL;DR: In this paper, a computer simulation of sieving behavior of powders was performed to estimate the sieving rate by the particle element method by the simulation of the time-residue curve.

TL;DR: In this article, wavelet multiresolution analysis and cross-correlation analysis were applied to experimental pressure signals in order to analyze the characteristics of swirling flow pneumatic conveying in both Fourier and physical spaces.

TL;DR: In this paper, a co-axial double rotating cylinders mill and a tumbling ball mill were used to investigate the amorphization behavior of kaolinite powder under atmospheric conditions.

TL;DR: A review of the theories and experimental studies of the deposition process can be found in this paper, which describes the principles and procedures which may be used to estimate the extent of deposition, demonstrates the success and limitations of these procedures and outlines certain directions for future studies.

TL;DR: In this paper, the same reactant mixture produced a dispersion of amorphous cobalt basic carbonate [2CoCO 3 · Co(OH) 2 · H 2 O] particles and the shell and core materials of the coated particles transformed, respectively, into Co 2 O 3, and NiO, while producing a third phase (NiCo 2 O 4 ) at the core/coating interface.

TL;DR: In this article, a dry powder inhalation (DPI) formulation for steroid KSR-592 was developed by the spherical agglomeration method, and the results showed that the formulation prepared by mixing for 2 min showed the highest respirable fraction value compared with the formulations mixed for other lengths of time.

TL;DR: In this paper, a nano-size titanium powder was prepared by a novel chemical solution synthesis route from titanium dioxide (TiO 2 ), which was allowed to form a complex, titanium catecholate precursor, in the presence of ammonium sulfate and concentrated sulfuric acid.

TL;DR: In this paper, the initial coordinates of the disks' center and the filter boundary were defined using the stack disk method in the louvered-wall configuration described in the Appendix, and the flow pattern histories of granular solids, velocity field and development of quasi-stagnant zones close to louvered walls of three kinds of two-dimensional (2D) symmetrical moving granular filter beds were studied numerically.

TL;DR: In this paper, a peak shear stress is observed on the consolidation of loosely filled samples of coarse (above 1 mm diameter) granular materials using an annular shear cell.

TL;DR: In this article, the effects of altering the particle size, compression pressure, drug species and the particle content on compressibility and compactibility of matrix tablets were evaluated and the release mechanism was discussed.

TL;DR: In this paper, a multi-ring media mill was used for aqueous slurries of Mg(OH) 2 and TiO 2 powder mixtures in the concentration range from 6.9 to 50 wt%. Rings used as grinding media were made of partially stabilized zirconia or polyoxymethylene.

TL;DR: In this article, a new process was proposed to introduce active sites onto calcium carbonate powder, which consists of three steps: (i) chemical surface modification, (ii) surface oxidation and (iii) surface hydroxylation.

TL;DR: In this article, a new method for production of fine Shirasu balloons from glassy volcanic materials, named Shirasu, was developed, which can be used to supersede conventional Shirasu balloon.

TL;DR: In this paper, the authors used the smoothed particle (SP) method to simulate the velocity and stress fields of powders with uncountably numerous particles, and compared the calculated results with the measured values under nearly the same conditions, and a fairly good agreement among them was obtained.

TL;DR: Particle formation by mixing a solution containing nucleated monomers with a miscible non-solvent, a procedure known as the dilution method, has been investigated in order to check the validity of our previous model of homogeneous nucleation where the growth rate of nuclei is controlled by the diffusion of monomers as discussed by the authors.

TL;DR: In this article, the segregation process of binary mixture of bronze disks was studied, where equal masses of the different sized disks were put in a container subjected to an external vertical vibration and the velocity fields of both species were measured by an image processing system.

TL;DR: In this paper, the variation of the quantity of poly(ethyleneglycol) adsorbed on TiO 2, which follows a logarithmic law and is consistent with the exponential decrease in non-ionic polymer density observed by Hesselink at the solid-liquid interface, results in reduced ζ potential values.

TL;DR: In this paper, three kinds of quantitative indices, i.e., the degree of mixedness, an area-based criterion and the box-counting fractal dimension, have been investigated to find out their suitability for evaluating the dispersion of single additives in compounded material.

TL;DR: In this paper, the authors provide design information for flow aid systems in the pneumatic conveying of powders, specifically for the system involving the use of knockers when an inclined pipeline is choked with powder.

TL;DR: In this article, surface corona discharged-induced plasma chemical process (SPCP-CVD) was applied as the surface modification method to introduce functional groups (aminopropyl groups) onto the inner surface of a porous ceramic membrane.

TL;DR: In this article, an image analysis technique was applied to evaluate the dispersion state of chopped aramid fiber (average diameter 12 μm and aspect ratio 83.3) in a matrix.